1 Human development is the scientific study of processes of change and stability.  The scientific study of human development began with studies of childhood during the nineteenth century.
verb (used with object), cultivated, cultivating. 1. to prepare and work on (land) in order to raise crops; till. 2. to use a cultivator on. 3. to promote or improve the growth of (a plant, crop, etc.) by labor and attention.
Farmers clear land in order to cultivate their crops - this removal of the existing community is the disturbance. Cultivating crops is fighting secondary succession because the farmers are trying to prevent weeds (opportunist, r-selected species) from outcompeting their crops.